Vehicle & Technical > Discovery

Double Battery set up.

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stageonesimmo:
If the very clever little boxes they sell that are supposed to work all this out, cant then they arent worth the money they cost are they?!!

I'm no expert, but not a novice either and I reckon its as simple as this - the alternator will supply the same voltage (roughly dependent on revs obviously) to how ever many batteries you have.  It will supply the amperage needed to each battery as it needs it same as it does with just one, (if one battery only wants 5 amps it doesn't produce 50 and throw the excess overboard, it just produces 5 amps), so if one needs more it'll get it and vice versa, all the clever little box of tricks does as far as I can tell is make sure each one gets what it wants and displays to you what its doing as it does so.

Stick with the ones you have and try it - I reckon it'll work fine.

Range Rover Blues:
It's utter coblers TBH, you can use 2 batteries of any size as long as they are both the same nominal voltage (some fancy new types are slightly different).

When it really counts and you are dragging lots of current, the bigger battery will have the lower internal resistance and suplly most of the power.

If you have a split charge system then even better as both batteries are effectively isolated unless being charged.

Landynuts:
I think that if you are using a split charge system then the batteries can be what ever capacity you want. How ever if you are connecting them in parallel then you will not get the full benefit as the higher capacity one will be dragged down by the lower one.

muddyjames:
So I need a split charge system like in a caravan 12S socket?

L90OOK:

--- Quote from: muddyjames on January 17, 2008, 15:59:07 ---So I need a split charge system like in a caravan 12S socket?

--- End quote ---
I would fit THIS if you are using different batteries.  If using the same batteries then wire in parallel.  :afro:

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